DWG File Conversion for NanoCad

I need 1-5 DWG files converted to a version compatible with NanoCad (DWG 2013). The current versions are too high for me to open. The files contain text annotations that need to be checked for compatibility after conversion... (Budget: $250 - $750 USD, Jobs: 3D CAD, 3D Design, 3D Drafting, 3D Rendering, AutoCAD, Building Architecture, CAD/CAM, NanoCAD)